如何防止在下一段中突出顯示錶格行？

Question

當我選擇一個表格行並點擊city標籤下的'Ok'時，它突出顯示了行，但是當我將標籤更改爲town時，它突出顯示town標籤中的同一行，即使我沒有選擇它。也就是說，我突出顯示city選項卡下的第二和第三行，它突出顯示第town選項卡下的第二和第三行，而無需執行任何操作。下面是我的代碼

public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{ 
    let myCell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CityCell 
    switch (segCtrl.selectedSegmentIndex) 
    { 
    case 0: 
     myCell.myLabel.text = cityName[indexPath.row] 
     break 
    case 1: 
     myCell.myLabel.text = townName[indexPath.row] 
     break 
    default:break 
    } 
    return myCell 
} 

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){ 

let cell = tableView.cellForRow(at: indexPath)! 
let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .alert) 

let ok = UIAlertAction(title: "Ok", style: .default, handler: { (action) -> Void in 
    let cell = tableView.cellForRow(at: indexPath)! 
    cell.backgroundColor = UIColor(white: 1.0, alpha:0.5) 
    }) 
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: { (action) -> Void in 
}) 
    alertController.addAction(ok) 
    alertController.addAction(cancel) 
present(alertController, animated: true, completion: nil) 
} 

如何防止這種高亮從下一個標籤發生，它限制的地方，我居然選擇了行？

Answer 1

我在使用objective-c。所以，如果我的swift代碼錯誤，很抱歉。

// global variable which carry selection-indexPath 
var citySelectedIndexPaths = [IndexPath]() 
var townSelectedIndexPaths = [IndexPath]() 

public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{ 
    let myCell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CityCell 

    // add this line 
    myCell.backgroundColor = UIColor(white: 1.0, alpha:1.0) // default color 

    switch (segCtrl.selectedSegmentIndex) 
    { 
    case 0: 
     myCell.myLabel.text = cityName[indexPath.row] 
     if citySelectedIndexPaths.contains(indexPath) { 
      myCell.backgroundColor = UIColor(white: 1.0, alpha:0.5) 
     } 
     break 
    case 1: 
     myCell.myLabel.text = townName[indexPath.row] 
     if townSelectedIndexPaths.contains(indexPath) { 
      myCell.backgroundColor = UIColor(white: 1.0, alpha:0.5) 
     } 
     break 
    default:break 
    } 
    return myCell 
} 

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){ 

let cell = tableView.cellForRow(at: indexPath)! 
let alertController = UIAlertController(title: nil, message: nil, preferredStyle: .alert) 

let ok = UIAlertAction(title: "Ok", style: .default, handler: { (action) -> Void in 
    let cell = tableView.cellForRow(at: indexPath)! 
    cell.backgroundColor = UIColor(white: 1.0, alpha:0.5) 

    // save selection indexPath 
    switch (segCtrl.selectedSegmentIndex) 
    { 
    case 0: 
     if citySelectedIndexPaths.contains(indexPath) { 
      let indexValue = citySelectedIndexPaths.indexOf(indexPath) 
      citySelectedIndexPaths.removeAtIndex(indexValue) 
     } else { 
      citySelectedIndexPaths.append(indexPath); 
     } 
     break 
    case 1: 
     if townSelectedIndexPaths.contains(indexPath) { 
      let indexValue = townSelectedIndexPaths.indexOf(indexPath) 
      townSelectedIndexPaths.removeAtIndex(indexValue) 
     } else { 
      townSelectedIndexPaths.append(indexPath); 
     } 
     break 
    default:break 
    } 

    }) 
let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: { (action) -> Void in 
}) 
    alertController.addAction(ok) 
    alertController.addAction(cancel) 
present(alertController, animated: true, completion: nil) 
} 

Answer 2

現在在您的代碼中，您可以手動設置背景。

cell.backgroundColor = UIColor(white: 1.0, alpha:0.5) 

但是您在選擇其他單元格後沒有重置cell.backgroundColor。因此，您需要存儲當前選定的cell's indexPath，並且每次在ok UIAlertAction中選擇新的單元時請致電reloadData。在cellForRowAtIndexPath中，只需執行具有選定或未選定階段的單元格。